I did this a little bit ago, just haven't had time to get on and share.
I removed the passenger side mirror and made a new block using scrap plastic I had around the house and then wrapped it all in duct tape to make a decent seal. Not as clean as it could be, but simple and effective!
![](http://i1249.photobucket.com/albums/hh514/TurnpikeCruiser302/1997%20Honda%20Civic%20HX/2014-05-24_17-41-49_916_zps7eaed665.jpg)